Electronic device having ferroelectric memory

Details Electronic device having ferroelectric memory Electronic device having ferroelectric memory

1996-05-13

1998-12-15

Nguyen, Chanh

Computer graphics processing and selective visual display system

Computer graphic processing system

Plural graphics processors

345211, G09G 504

Patent

active

058502319

ABSTRACT:
An electronic device maintains data utilizing a ferroelectric memory, not requiring a backup power source voltage. Data such as schedule data and telephone number data is stored in a ferroelectric RAM which switches between a dynamic mode and a nonvolatile mode. When a clock mode is designated by a "CLK" key, a memory control circuit causes the ferroelectric RAM to be switched to the nonvolatile mode to maintain the data stored therein. When a schedule mode or a telephone mode is designated by means of a "Sch" key or a "Tel" key, the ferroelectric RAM is switched to the nonvolatile mode to write/read data therein/therefrom. When it is detected that a battery voltage is lowered or the battery is removed from the electronic device, the ferroelectric RAM is switched to the nonvolatile mode to protect the stored data.

REFERENCES:
patent: 5060191 (1991-10-01), Nagasaki et al.
patent: 5077612 (1991-12-01), Megrgardt et al.
patent: 5198384 (1993-03-01), Dennison
patent: 5270967 (1993-12-01), Moazzami et al.
patent: 5297077 (1994-03-01), Imai et al.
patent: 5307304 (1994-04-01), Saito et al.

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